Kylie Jenner is said to be fuming about the news that Rob Kardashian has hooked up with Blac Chyna.

It has been recently confirmed that Rob Kardashian and Blac Chyna are dating. However, there were concerns that the model is only using the "Keeping Up with the Kardashians" star to get back at Kylie Jenner.

People reported that this has caused some friction between Kylie Jenner and the reclusive actor. "Kylie is livid," a source told the publication.

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"She feels super betrayed and can't understand why someone in her own family would stab her in the back like that."

There were speculations that Kylie Jenner and Blac Chyna have been feuding for a long time, especially since Chyna and Tyga have a child together.

It was previously reported that Kylie Jenner can't let go of Tyga because she does not want him to go back to Blac Chyna. Apparently, the 18-year-old can't stand Chyna's criticism of their relationship.

Rumors on Rob Kardashian and Blac Chyna's relationship started when the model posted a photo of herself with a man's tattooed arm wrapped around her. The tattooes gave Rob Kardashian away.

Meanwhile, Blac Chyna seems to be enjoying her time with Rob Kardashian as well as the chaos she's causing in the Kardashian-Jenner family. HollywoodLife.com reported that the model has dissed Tyga by comparing his bedroom skills with her new boyfriend.

"Blac Chyna is totally playing to Rob's ego, she's been telling him that he's better in bed than Tyga," a source said. "He hasn't had this much attention from a woman in a long time, she's got him sprung."

"A lot of people are convinced she's just playing him and it's all just about getting back at Kylie, but it definitely is doing Rob good in the short-term."

Rob Kardashian and Blac Chyna have known each other since 2014 when they met at Kendall Jenner's 18th birthday party at an amusement park in Los Angeles.